/* Real or AI? — dark, dense, image-first */
:root {
  --bg: #0d1017; --panel: #161b26; --line: #262e40;
  --ink: #e8ecf4; --dim: #8b95a9; --acc: #5eb1ff;
  --ok: #37d67a; --bad: #ff5d6c;
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--ink);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }

.screen { display: none; max-width: 1180px; margin: 0 auto; padding: 16px; }
.screen.active { display: block; }
h1 { font-size: 2rem; margin: .6em 0 .2em; letter-spacing: .5px; }
.tagline { color: var(--dim); max-width: 46em; }
.foot { color: var(--dim); font-size: .85rem; margin-top: 2em; }
.foot a { color: var(--acc); }

/* ---------- start ---------- */
.setup { background: var(--panel); border: 1px solid var(--line);
  border-radius: 12px; padding: 18px; margin: 22px 0; display: grid; gap: 18px; }
.setup-row label { display: block; color: var(--dim); font-size: .8rem;
  text-transform: uppercase; letter-spacing: .1em; margin-bottom: 6px; }
input[type=range] { width: 100%; accent-color: var(--acc); }
output { display: block; margin-top: 4px; color: var(--acc); font-weight: 600; }
.btnrow { display: flex; gap: 8px; flex-wrap: wrap; }
.tier { background: var(--panel); color: var(--ink); border: 1px solid var(--line);
  border-radius: 10px; padding: 10px 14px; cursor: pointer; }
.tier.sel { border-color: var(--acc); color: var(--acc); font-weight: 700; }
.cta { background: var(--acc); color: #06121f; border: 0; border-radius: 12px;
  padding: 14px 26px; font-size: 1.05rem; font-weight: 800; cursor: pointer; }
.cta.secondary { background: var(--panel); color: var(--ink); border: 1px solid var(--line); }
.cta.small { padding: 9px 18px; }
.bests { margin-top: 14px; color: var(--dim); }

/* ---------- game HUD ---------- */
.hud { display: flex; align-items: center; gap: 16px; padding: 10px 2px;
  position: sticky; top: 0; background: var(--bg); z-index: 5;
  border-bottom: 1px solid var(--line); }
.hud #roundLabel { font-weight: 800; }
.hud .score { color: var(--ok); font-weight: 800; }
.hud .tierlabel { margin-left: auto; color: var(--dim); font-size: .85rem; }

/* ---------- grid: fixed layout per N ---------- */
.grid { display: grid; gap: 10px; margin-top: 12px; }
.g2 { grid-template-columns: repeat(2, 1fr); }
.g3 { grid-template-columns: repeat(3, 1fr); }
.g4 { grid-template-columns: repeat(2, 1fr); }   /* 2x2 */
.g5 { grid-template-columns: repeat(3, 1fr); }
.g6 { grid-template-columns: repeat(3, 1fr); }
.g7 { grid-template-columns: repeat(3, 1fr); }
.g8 { grid-template-columns: repeat(4, 1fr); }
.g9 { grid-template-columns: repeat(3, 1fr); }
@media (min-width: 900px) {
  .g2 { grid-template-columns: repeat(2, 1fr); }
  .g3 { grid-template-columns: repeat(3, 1fr); }
  .g4 { grid-template-columns: repeat(4, 1fr); }
  .g5 { grid-template-columns: repeat(5, 1fr); }
  .g6 { grid-template-columns: repeat(3, 1fr); }
  .g7 { grid-template-columns: repeat(4, 1fr); }
  .g8 { grid-template-columns: repeat(4, 1fr); }
  .g9 { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 620px) {
  .g2, .g3 { grid-template-columns: 1fr; }
  .g4, .g5, .g6, .g7, .g8, .g9 { grid-template-columns: repeat(2, 1fr); }
}

/* cards: square frame, image fully visible (contain) — no cropping artifacts */
.hidden { display: none !important; }
.card { position: relative; padding: 0; border: 2px solid var(--line);
  border-radius: 10px; background: #090b10; cursor: zoom-in; overflow: hidden;
  aspect-ratio: 1 / 1; }
.card img { width: 100%; height: 100%; object-fit: contain; display: block; }
.card.sel { border-color: var(--acc); box-shadow: 0 0 0 3px var(--acc); }
.card.dim { opacity: .35; }
.card.is-ai { border-color: var(--ok); box-shadow: 0 0 0 3px var(--ok), 0 0 24px #37d67a55; cursor: default; }
.card.is-real { border-color: var(--bad); box-shadow: 0 0 0 3px var(--bad); cursor: default; }
.stamp { position: absolute; top: 8px; left: 8px; padding: 3px 10px;
  border-radius: 6px; font-weight: 900; font-size: .8rem; letter-spacing: .1em; }
.stamp.ai { background: var(--ok); color: #04170c; }
.stamp.real { background: var(--bad); color: #1d0407; }

/* ---------- action bar (pick: Menu+Confirm · reveal: verdict+Next) ---------- */
.revealbar { position: sticky; bottom: 0; display: flex; align-items: center;
  gap: 14px; background: var(--panel); border: 1px solid var(--line);
  border-radius: 12px; padding: 12px 16px; margin-top: 12px; }
#verdict { font-weight: 700; }
.pickhint { color: var(--dim); font-size: .9rem; margin-right: auto; }
.revealbar #verdict { margin-right: auto; }

/* ---------- zoom overlay ---------- */
.zoom { position: fixed; inset: 0; z-index: 50; background: rgba(4,6,10,.96);
  display: flex; align-items: center; justify-content: center; cursor: zoom-out; }
.zoom img { max-width: 100vw; max-height: 100vh; width: 100%; height: 100%;
  object-fit: contain; }
.zoomtip { position: fixed; bottom: 14px; left: 50%; transform: translateX(-50%);
  color: var(--dim); font-size: .85rem; background: #0009; padding: 4px 12px;
  border-radius: 8px; pointer-events: none; }

/* ---------- end ---------- */
.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin: 24px 0; }
.stats div { background: var(--panel); border: 1px solid var(--line);
  border-radius: 12px; padding: 16px; text-align: center; color: var(--dim); }
.stats span { display: block; font-size: 2rem; font-weight: 900; color: var(--ink); }
@media (max-width: 620px) { .stats { grid-template-columns: 1fr; } }